HELICAL ROTOR PUMP
Definition
A <HELICAL ROTOR PUMP> is a <ROTARY PUMP> that consists of a helical rotor and a twin helix, twice the wavelength and double the diameter helical hole in a rubber stator. The rotor seals tightly against the rubber stator as it rotates, forming a set of fixed-size cavities in between. The cavities move when the rotor is rotated but their shape or volume does not change. The pumped material is moved inside the cavities.